1 // SPDX-License-Identifier: GPL-2.0+ 2 /* Xilinx GMII2RGMII Converter driver 3 * 4 * Copyright (C) 2016 Xilinx, Inc. 5 * Copyright (C) 2016 Andrew Lunn <andrew@lunn.ch> 6 * 7 * Author: Andrew Lunn <andrew@lunn.ch> 8 * Author: Kedareswara rao Appana <appanad@xilinx.com> 9 * 10 * Description: 11 * This driver is developed for Xilinx GMII2RGMII Converter 12 */ 13 #include <linux/module.h> 14 #include <linux/kernel.h> 15 #include <linux/mii.h> 16 #include <linux/mdio.h> 17 #include <linux/phy.h> 18 #include <linux/of_mdio.h> 19 20 #define XILINX_GMII2RGMII_REG 0x10 21 #define XILINX_GMII2RGMII_SPEED_MASK (BMCR_SPEED1000 | BMCR_SPEED100) 22 23 struct gmii2rgmii { 24 struct phy_device *phy_dev; 25 struct phy_driver *phy_drv; 26 struct phy_driver conv_phy_drv; 27 struct mdio_device *mdio; 28 }; 29 30 static int xgmiitorgmii_read_status(struct phy_device *phydev) 31 { 32 struct gmii2rgmii *priv = phydev->priv; 33 struct mii_bus *bus = priv->mdio->bus; 34 int addr = priv->mdio->addr; 35 u16 val = 0; 36 int err; 37 38 err = priv->phy_drv->read_status(phydev); 39 if (err < 0) 40 return err; 41 42 val = mdiobus_read(bus, addr, XILINX_GMII2RGMII_REG); 43 val &= ~XILINX_GMII2RGMII_SPEED_MASK; 44 45 if (phydev->speed == SPEED_1000) 46 val |= BMCR_SPEED1000; 47 else if (phydev->speed == SPEED_100) 48 val |= BMCR_SPEED100; 49 else 50 val |= BMCR_SPEED10; 51 52 mdiobus_write(bus, addr, XILINX_GMII2RGMII_REG, val); 53 54 return 0; 55 } 56 57 static int xgmiitorgmii_probe(struct mdio_device *mdiodev) 58 { 59 struct device *dev = &mdiodev->dev; 60 struct device_node *np = dev->of_node, *phy_node; 61 struct gmii2rgmii *priv; 62 63 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 64 if (!priv) 65 return -ENOMEM; 66 67 phy_node = of_parse_phandle(np, "phy-handle", 0); 68 if (!phy_node) { 69 dev_err(dev, "Couldn't parse phy-handle\n"); 70 return -ENODEV; 71 } 72 73 priv->phy_dev = of_phy_find_device(phy_node); 74 of_node_put(phy_node); 75 if (!priv->phy_dev) { 76 dev_info(dev, "Couldn't find phydev\n"); 77 return -EPROBE_DEFER; 78 } 79 80 if (!priv->phy_dev->drv) { 81 dev_info(dev, "Attached phy not ready\n"); 82 return -EPROBE_DEFER; 83 } 84 85 priv->mdio = mdiodev; 86 priv->phy_drv = priv->phy_dev->drv; 87 memcpy(&priv->conv_phy_drv, priv->phy_dev->drv, 88 sizeof(struct phy_driver)); 89 priv->conv_phy_drv.read_status = xgmiitorgmii_read_status; 90 priv->phy_dev->priv = priv; 91 priv->phy_dev->drv = &priv->conv_phy_drv; 92 93 return 0; 94 } 95 96 static const struct of_device_id xgmiitorgmii_of_match[] = { 97 { .compatible = "xlnx,gmii-to-rgmii-1.0" }, 98 {}, 99 }; 100 MODULE_DEVICE_TABLE(of, xgmiitorgmii_of_match); 101 102 static struct mdio_driver xgmiitorgmii_driver = { 103 .probe = xgmiitorgmii_probe, 104 .mdiodrv.driver = { 105 .name = "xgmiitorgmii", 106 .of_match_table = xgmiitorgmii_of_match, 107 }, 108 }; 109 110 mdio_module_driver(xgmiitorgmii_driver); 111 112 MODULE_DESCRIPTION("Xilinx GMII2RGMII converter driver"); 113 MODULE_LICENSE("GPL"); 114